C21 is a new technological advanced devolved city with the purpose of establishing their corporation named D-93. With the rumours flying around about the possible upcoming deadliest war, ungifted humans have been ordered to evacuate to newly built towns.

Byun Baekhyun recently transferred to a new high school for the chance to submit his art at the annual art exhibiton and his possible debut as an artist. The small boy then decided to use his school's sunflower garden as his inspiration for the exhibition, but he is constantly warned that only gangsters hang out there and it could be dangerous. There Baekhyun meets a silver haired giant who doesn't seem to be such a violent gang

Ten people were chosen at random through a lottery drawing. They were supposed to win prizes, but instead, they woke up on the floor of a dark, damp cave, with tunnels all around them. There was no telling which one led to the outside.
A mysterious voice told them that they could return to their homes, as soon as they completed six games. If they did not agree to participate, they would die there.